Nd and Sr isotopic constraints on the petrogenesis of the west side of the northern Coast Mountains Batholith, Alaskan and Canadian Cordillera

S. D. Samson, P. J. Patchett, W. C. McClelland, George E Gehrels

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Abstract

Nd and Sr isotopic ratios are reported from 15 samples of plutons of the northern Coast Mountains Batholith (CMB), between the Alexander-Wrangellia terrane and the Stikine terrane of southeastern Alaska. Samples of plutons that are part of the Late Cretaceous-Eocene CMB suite have a range in initial εNd of -3.0 to -0.2 and 87Sr/86Sr of 0.70494-0.70607. Two plutons that are probably older than the bulk of the CMB plutons have present-day εNd values of -6.8 and -2.6. The Late Cretaceous-Eocene plutons have Nd depleted-mantle model ages (tDM) of 620-1070 Ma. These data indicate that the northern CMB must contain a significant component of old, evolved continental crust. The mid to Late Proterozoic tDM ages of the CMB plutons are probably a result of a mixture of Early Proterozoic crustal material with younger, juvenile crust. -from Authors

Original languageEnglish (US)
Pages (from-to)939-946
Number of pages8
JournalCanadian Journal of Earth Sciences
Volume28
Issue number6
StatePublished - 1991

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batholith
petrogenesis
cordillera
pluton
mountain
coast
terrane
Proterozoic
Eocene
Cretaceous
isotopic ratio
continental crust
crust
mantle

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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Nd and Sr isotopic constraints on the petrogenesis of the west side of the northern Coast Mountains Batholith, Alaskan and Canadian Cordillera. / Samson, S. D.; Patchett, P. J.; McClelland, W. C.; Gehrels, George E.

In: Canadian Journal of Earth Sciences, Vol. 28, No. 6, 1991, p. 939-946.

Research output: Contribution to journalArticle

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AU - Gehrels, George E

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